Improve handwriting Ink window lifetime

1. When the system removes the last known stylus device
and has no other stylus available, remove the Ink window.

2. Create InkWindow only if the device+IME combination supports
handwriting and the stylus is being used.

Bug: 243571274
Bug: 239121683
Bug: 210039666

Test: atest StylusHandwritingTest
Change-Id: Icd3eea91fe144cff7100d3ecf19191c064c0d196